bolingbolo/CS体系结构-记账系统/MainActivity.java

package com.example.account_book;

import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;

import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;

import android.view.LayoutInflater;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AdapterView;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

public class MainActivity extends AppCompatActivity {

    private List<CostBean> mCostBeanList;
    private DatabaseHelper mDatabaseHelper;
    private CostListAdapter mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        mDatabaseHelper = new DatabaseHelper(this);
        mCostBeanList = new ArrayList<>();
        ListView costList = (ListView) findViewById(R.id.lv_main);

        initCostDate();
        mAdapter = new CostListAdapter(this, mCostBeanList);
        costList.setAdapter(mAdapter);

        //单击每一个item实现删除功能
        costList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
                AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("删除");
                builder.setMessage("是否删除此账单?");
                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        mDatabaseHelper.toDelete(mCostBeanList.get(position));
                        mCostBeanList.remove(position);
                        mAdapter.notifyDataSetChanged();//通知list_view刷新
                    }
                });
                builder.setNegativeButton("取消",null);
                builder.create().show();
            }
        });


        FloatingActionButton fab = findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
                LayoutInflater inflater = LayoutInflater.from(MainActivity.this);
                View viewDialog = inflater.inflate(R.layout.new_cost, null);//联系new_cost布局，才能使用布局中的数据元素
                final EditText title = (EditText) viewDialog.findViewById(R.id.ct_cost_title);
                final EditText money = (EditText) viewDialog.findViewById(R.id.ct_cost_money);
                final DatePicker date = (DatePicker) viewDialog.findViewById(R.id.ct_cost_date);
                builder.setView(viewDialog);//将布局设置给dialog
                builder.setTitle("新建支出");//dialog的标题
                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {//当点击确定时，
                        CostBean costBean = new CostBean();
                        costBean.costTitle = title.getText().toString();//将对应的属性输入
                        costBean.costMoney = money.getText().toString();
                        costBean.costDate = date.getYear() + "-" + (date.getMonth() + 1) + "-" +
                                date.getDayOfMonth();

                        //储存date时特别要注意，我们后面要根据costDate排序，所以要将其标准化
                        costBean.costDate = date.getYear()+"-";
                        if(date.getMonth()+1<10)   costBean.costDate+="0";
                        costBean.costDate+=(date.getMonth()+1)+"-";
                        if(date.getDayOfMonth()<10)    costBean.costDate+="0";
                        costBean.costDate+=date.getDayOfMonth();

                        //当输入为空时提醒
                        if("".equals(costBean.costTitle) || "".equals(costBean.costMoney) || "".equals(costBean.costDate))
                        {
                            Toast.makeText(MainActivity.this,"信息不完整",Toast.LENGTH_SHORT).show();
                            return;
                        }
                        if(costBean.costMoney.length()>4)
                        {
                            Toast.makeText(MainActivity.this,"金额过大",Toast.LENGTH_SHORT).show();
                            return;
                        }
                        mDatabaseHelper.insertCost(costBean);//将数据插入数据库

                        mCostBeanList.add(costBean);//将list改变，才能刷新
                        mAdapter.notifyDataSetChanged();//通知list_view刷新，这样才能显示新的账单
                    }
                });
                builder.setNegativeButton("取消", null);//取消时退出
                builder.create().show();//显示dialog，即自定义的布局
            }
        });
    }


    private void initCostDate() {
        /*
        mDatabaseHelper.deleteAllData();//清理所有数据
        for (int i=0; i<6; i++) {
            CostBean costBean = new CostBean();
            costBean.costTitle = i + "mock";
            costBean.costDate = "11-11";
            costBean.costMoney = "20";
            mDatabaseHelper.insertCost(costBean);
        }*/
        Cursor cursor = mDatabaseHelper.getAllCostData();//数据库中插入所有数据并显示到list_view中
        if(cursor != null){
            while (cursor.moveToNext()){
                CostBean costBean = new CostBean();
                costBean.costTitle = cursor.getString(cursor.getColumnIndex("cost_title"));
                costBean.costDate = cursor.getString(cursor.getColumnIndex("cost_date"));
                costBean.costMoney = cursor.getString(cursor.getColumnIndex("cost_money"));
                mCostBeanList.add(costBean);
            }
            cursor.close();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        {

            //noinspection SimplifiableIfStatement
            if (id == R.id.action_chart) {
                Intent intent = new Intent(MainActivity.this, ChartsActivity.class);
                intent.putExtra("cost_list", (Serializable) mCostBeanList);//将消费金额序列化传给chart
                startActivity(intent);
                return true;
            }

//            else if (id == R.id.action_about){
//                Intent intent_a = new Intent(getApplicationContext(),AboutActivity.class);
//                startActivity(intent_a);
//                return true;
//
//            }
            else if (id == R.id.action_about){
                Intent intent_a = new Intent(getApplicationContext(),web.class);
                startActivity(intent_a);
                return true;

            }

            else if (id  == R.id.anction_delete_all){
                mDatabaseHelper.deleteAllData();
                mCostBeanList.clear();
                mAdapter.notifyDataSetChanged();
                return true;
            }
        }

        return super.onOptionsItemSelected(item);
    }
}